/Engine/Source/Editor/UMGEditor/Public/Designer/SDesignerView.h
The designer for widgets. Allows for laying out widgets in a drag and drop environment.
class SDesignerView : public [SDesignSurface](API\Editor\UMGEditor\Designer\SDesignSurface), public [FGCObject](API\Runtime\CoreUObject\UObject\FGCObject), public [IUMGDesigner](API\Editor\UMGEditor\IUMGDesigner)